EN CSharp Keyword typeof

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C#: typeof

Handbook C# · Practical Guide

Returns System.Type for the given type; operand is not an instance.

Simple example (Example.cs)

Save this example separately as Example.cs. Run it independently of the other examples on this page.

Example.cs:

// PROJECT-EXAMPLE
System.Console.WriteLine(typeof(int).Name);

Result:

Int32

Syntax

typeof(Type) / typeof(Generic<>)

Example 1: simple form

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        Type type = typeof(Dictionary<string, int>);
        Console.WriteLine(type.FullName);
    }
}

Example 2: another practical form

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        Type generic = typeof(List<>);
        Console.WriteLine(generic.IsGenericTypeDefinition);
        Console.WriteLine(typeof(int).IsValueType);
    }
}

Official source: Microsoft Learn.